Consolidate creation of properties and allow reuse.

Similar to how we have Object Types under Current space in the settings menu, we should also have a Object Properties, that allow us to create standard fields, meant to be reused. Whenever we then add properties to an object, they would appear in that list.

Example:

Many of my objects have an URL field. I would love to create one once, configure how I like it, and add it to multiple objects.